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                <h1 class="post-title" itemprop="name headline"> Winpcap网络编程五之ARP协议获得MAC表及主机通信 </h1>
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                <h2 id="学习文档"><a href="#学习文档" class="headerlink" title="学习文档"></a>学习文档</h2>
                <p>这里我们直接进入正题吧，关于Winpcap的基础知识讲解这里就不再赘述了。在这里给大家提供一些学习网址 <a href="http://blog.csdn.net/column/details/winpcap.html" target="_blank" rel="noopener">Winpcap网络编程及通信教程</a><a href="http://www.ferrisxu.com/WinPcap/html/" target="_blank" rel="noopener">Winpcap中文技术文档</a></p>
                <h2 id="学习内容"><a href="#学习内容" class="headerlink" title="学习内容"></a>学习内容</h2>
                <ul>
                  <li>获取设备列表</li>
                  <li>获取已安装设备的高级信息</li>
                  <li>打开适配器并捕获数据包</li>
                  <li>不用回调方法捕获数据包</li>
                  <li>过滤数据包</li>
                  <li>分析数据包</li>
                  <li>处理脱机堆文件</li>
                  <li>发送数据包</li>
                  <li>收集并统计网络流量</li>
                </ul>
                <p>这些内容，在上述两个链接中均已经有了比较详细的讲解，希望对大家有帮助。</p>
                <h2 id="两台主机通信实战"><a href="#两台主机通信实战" class="headerlink" title="两台主机通信实战"></a>两台主机通信实战</h2>
                <p>完成两台主机之间的数据通信（数据链路层）</p>
                <ul>
                  <li>仿真ARP协议获得网段内主机的MAC表</li>
                  <li>使用帧完成两台主机的通信（Hello! I’m …)</li>
                </ul>
                <p>首先我们要理解ARP是干嘛的，ARP主要作用就是通过IP地址来获取MAC地址。那么怎样获取呢？本机向局域网内主机发送ARP包，ARP包内包含了目的IP，源IP，目的MAC，源MAC，其中目的MAC地址为广播地址,FF-FF-FF-FF-FF-FF,即向局域网内所有主机发送一个ARP请求，那么其他主机收到这个请求之后则会向请求来源返回一个数据包。在这个返回的数据包中包含了自身的MAC地址。那么本机收到这些返回的数据包进行解析之后便会得到局域网内所有主机的MAC地址了.. 编程开始： 新建一个C++项目，配好环境，引入Winpcap相关的库，这些不再赘述。 头文件引入</p>
                <figure class="highlight dts">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="meta">#<span class="meta-keyword">define</span> HAVE_REMOTE</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> WPCAP</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;stdio.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;stdlib.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;pcap.h&gt;</span></span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>在main函数中首先声明一系列变量如下</p>
                <figure class="highlight cpp">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="keyword">char</span> *ip_addr;                                    <span class="comment">//IP地址</span></span><br><span class="line"><span class="keyword">char</span> *ip_netmask;                             <span class="comment">//子网掩码</span></span><br><span class="line"><span class="keyword">unsigned</span> <span class="keyword">char</span> *ip_mac;          <span class="comment">//本机MAC地址</span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>为这三个变量分配地址空间</p>
                <figure class="highlight cpp">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">ip_addr = (<span class="keyword">char</span> *) <span class="built_in">malloc</span>(<span class="keyword">sizeof</span>(<span class="keyword">char</span>) * <span class="number">16</span>); <span class="comment">//申请内存存放IP地址</span></span><br><span class="line">	<span class="keyword">if</span> (ip_addr == <span class="literal">NULL</span>)</span><br><span class="line">	&#123;</span><br><span class="line">		<span class="built_in">printf</span>(<span class="string">"申请内存存放IP地址失败!\n"</span>);</span><br><span class="line">		<span class="keyword">return</span> <span class="number">-1</span>;</span><br><span class="line">	&#125;</span><br><span class="line">	ip_netmask = (<span class="keyword">char</span> *) <span class="built_in">malloc</span>(<span class="keyword">sizeof</span>(<span class="keyword">char</span>) * <span class="number">16</span>); <span class="comment">//申请内存存放NETMASK地址</span></span><br><span class="line">	<span class="keyword">if</span> (ip_netmask == <span class="literal">NULL</span>)</span><br><span class="line">	&#123;</span><br><span class="line">		<span class="built_in">printf</span>(<span class="string">"申请内存存放NETMASK地址失败!\n"</span>);</span><br><span class="line">		<span class="keyword">return</span> <span class="number">-1</span>;</span><br><span class="line">	&#125;</span><br><span class="line">	ip_mac = (<span class="keyword">unsigned</span> <span class="keyword">char</span> *) <span class="built_in">malloc</span>(<span class="keyword">sizeof</span>(<span class="keyword">unsigned</span> <span class="keyword">char</span>) * <span class="number">6</span>); <span class="comment">//申请内存存放MAC地址</span></span><br><span class="line">	<span class="keyword">if</span> (ip_mac == <span class="literal">NULL</span>)</span><br><span class="line">	&#123;</span><br><span class="line">		<span class="built_in">printf</span>(<span class="string">"申请内存存放MAC地址失败!\n"</span>);</span><br><span class="line">		<span class="keyword">return</span> <span class="number">-1</span>;</span><br><span class="line">	&#125;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>接下来就是烂大街的程序,获取适配器列表并选中相应的适配器,注释已经在代码中了,如果还有不明白的请参照前几次的讲解。</p>
                <figure class="highlight xl">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="comment">//获取本地适配器列表</span></span><br><span class="line">	<span class="keyword">if</span>(pcap_findalldevs_ex(PCAP_SRC_IF_STRING,NULL,&amp;alldevs,errbuf) == -<span class="number">1</span>)&#123;</span><br><span class="line">		<span class="comment">//结果为-1代表出现获取适配器列表失败</span></span><br><span class="line">		fprintf(stderr,<span class="string">"Error in pcap_findalldevs_ex:\n"</span>,errbuf);</span><br><span class="line">		<span class="comment">//exit(0)代表正常退出,exit(other)为非正常退出,这个值会传给操作系统</span></span><br><span class="line">		exit(<span class="number">1</span>);</span><br><span class="line">	&#125;</span><br><span class="line">	</span><br><span class="line"></span><br><span class="line">	<span class="function"><span class="title">for</span>(d = alldevs;d !=NULL;d = d-&gt;</span>next)&#123;</span><br><span class="line">		<span class="function"><span class="title">printf</span>("-----------------------------------------------------------------\nnumber:%d\nname:%s\n",++i,d-&gt;</span><span class="keyword">name</span>);</span><br><span class="line">		<span class="function"><span class="title">if</span>(d-&gt;</span>description)&#123;</span><br><span class="line">			<span class="comment">//打印适配器的描述信息</span></span><br><span class="line">			<span class="function"><span class="title">printf</span>("description:%s\n",d-&gt;</span>description);</span><br><span class="line">		&#125;<span class="keyword">else</span>&#123;</span><br><span class="line">			<span class="comment">//适配器不存在描述信息</span></span><br><span class="line">			printf(<span class="string">"description:%s"</span>,<span class="string">"no description\n"</span>);</span><br><span class="line">		&#125;</span><br><span class="line">		<span class="comment">//打印本地环回地址</span></span><br><span class="line">		 <span class="function"><span class="title">printf</span>("\tLoopback: %s\n",(d-&gt;</span>flags &amp; PCAP_IF_LOOPBACK)?<span class="string">"yes"</span>:<span class="string">"no"</span>);</span><br><span class="line">		 <span class="comment">/**</span></span><br><span class="line"><span class="comment">		 pcap_addr *  next     指向下一个地址的指针</span></span><br><span class="line"><span class="comment">		 sockaddr *  addr       IP地址</span></span><br><span class="line"><span class="comment">		 sockaddr *  netmask  子网掩码</span></span><br><span class="line"><span class="comment">		 sockaddr *  broadaddr   广播地址</span></span><br><span class="line"><span class="comment">		 sockaddr *  dstaddr        目的地址</span></span><br><span class="line"><span class="comment">		 */</span></span><br><span class="line">		 pcap_addr_t *a;       <span class="comment">//网络适配器的地址用来存储变量</span></span><br><span class="line">		 <span class="function"><span class="title">for</span>(a = d-&gt;</span><span class="function"><span class="title">addresses</span>;a;a = a-&gt;</span>next)&#123;</span><br><span class="line">			 <span class="comment">//sa_family代表了地址的类型,是IPV4地址类型还是IPV6地址类型</span></span><br><span class="line">			 <span class="function"><span class="title">switch</span> (a-&gt;</span><span class="function"><span class="title">addr</span>-&gt;</span>sa_family)</span><br><span class="line">			 &#123;</span><br><span class="line">				 case AF_INET:  <span class="comment">//代表IPV4类型地址</span></span><br><span class="line">					 printf(<span class="string">"Address Family Name:AF_INET\n"</span>);</span><br><span class="line">					 <span class="function"><span class="title">if</span>(a-&gt;</span>addr)&#123;</span><br><span class="line">						 <span class="comment">//-&gt;的优先级等同于括号,高于强制类型转换,因为addr为sockaddr类型，对其进行操作须转换为sockaddr_in类型</span></span><br><span class="line">						 <span class="function"><span class="title">printf</span>("Address:%s\n",iptos(((struct sockaddr_in *)a-&gt;</span><span class="function"><span class="title">addr</span>)-&gt;</span>sin_addr.s_addr));</span><br><span class="line">					 &#125;</span><br><span class="line">					<span class="function"><span class="title">if</span> (a-&gt;</span>netmask)&#123;</span><br><span class="line">						 <span class="function"><span class="title">printf</span>("\tNetmask: %s\n",iptos(((struct sockaddr_in *)a-&gt;</span><span class="function"><span class="title">netmask</span>)-&gt;</span>sin_addr.s_addr));</span><br><span class="line">					&#125;</span><br><span class="line">					<span class="function"><span class="title">if</span> (a-&gt;</span>broadaddr)&#123;</span><br><span class="line">						   <span class="function"><span class="title">printf</span>("\tBroadcast Address: %s\n",iptos(((struct sockaddr_in *)a-&gt;</span><span class="function"><span class="title">broadaddr</span>)-&gt;</span>sin_addr.s_addr));</span><br><span class="line">					 &#125;</span><br><span class="line">					 <span class="function"><span class="title">if</span> (a-&gt;</span>dstaddr)&#123;</span><br><span class="line">						   <span class="function"><span class="title">printf</span>("\tDestination Address: %s\n",iptos(((struct sockaddr_in *)a-&gt;</span><span class="function"><span class="title">dstaddr</span>)-&gt;</span>sin_addr.s_addr));</span><br><span class="line">					 &#125;</span><br><span class="line">        			 break;</span><br><span class="line">				 case AF_INET6: <span class="comment">//代表IPV6类型地址</span></span><br><span class="line">					 printf(<span class="string">"Address Family Name:AF_INET6\n"</span>);</span><br><span class="line">					 printf(<span class="string">"this is an IPV6 address\n"</span>);</span><br><span class="line">					 break;</span><br><span class="line">				 default:</span><br><span class="line">					 break;</span><br><span class="line">			 &#125;</span><br><span class="line">		 &#125;</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="comment">//i为0代表上述循环未进入,即没有找到适配器,可能的原因为Winpcap没有安装导致未扫描到</span></span><br><span class="line">	<span class="keyword">if</span>(i == <span class="number">0</span>)&#123;</span><br><span class="line">		printf(<span class="string">"interface not found,please check winpcap installation"</span>);</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	int num;</span><br><span class="line">	printf(<span class="string">"Enter the interface number(1-%d):"</span>,i);</span><br><span class="line">	<span class="comment">//让用户选择选择哪个适配器进行抓包</span></span><br><span class="line">	scanf_s(<span class="string">"%d"</span>,&amp;num);</span><br><span class="line">	printf(<span class="string">"\n"</span>);</span><br><span class="line"></span><br><span class="line">	<span class="comment">//用户输入的数字超出合理范围</span></span><br><span class="line">	<span class="keyword">if</span>(num&lt;<span class="number">1</span>||num&gt;i)&#123;</span><br><span class="line">		printf(<span class="string">"number out of range\n"</span>);</span><br><span class="line">		pcap_freealldevs(alldevs);</span><br><span class="line">		return -<span class="number">1</span>;</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="comment">//跳转到选中的适配器</span></span><br><span class="line">	<span class="function"><span class="title">for</span>(d=alldevs, i=0; i&lt; num-1 ; d=d-&gt;</span>next, i++);</span><br><span class="line"></span><br><span class="line">	<span class="comment">//运行到此处说明用户的输入是合法的</span></span><br><span class="line">	<span class="function"><span class="title">if</span>((adhandle = pcap_open(d-&gt;</span><span class="keyword">name</span>,		<span class="comment">//设备名称</span></span><br><span class="line">														<span class="number">65535</span>,       <span class="comment">//存放数据包的内容长度</span></span><br><span class="line">														PCAP_OPENFLAG_PROMISCUOUS,  <span class="comment">//混杂模式</span></span><br><span class="line">														<span class="number">1000</span>,           <span class="comment">//超时时间</span></span><br><span class="line">														NULL,          <span class="comment">//远程验证</span></span><br><span class="line">														errbuf         <span class="comment">//错误缓冲</span></span><br><span class="line">														)) == NULL)&#123;</span><br><span class="line">        <span class="comment">//打开适配器失败,打印错误并释放适配器列表</span></span><br><span class="line">		<span class="function"><span class="title">fprintf</span>(stderr,"\nUnable to open the adapter. %s <span class="keyword">is</span> <span class="built_in">not</span> supported <span class="keyword">by</span> WinPcap\n", d-&gt;</span><span class="keyword">name</span>);</span><br><span class="line">        <span class="comment">// 释放设备列表 </span></span><br><span class="line">        pcap_freealldevs(alldevs);</span><br><span class="line">        return -<span class="number">1</span>;</span><br><span class="line">	&#125;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>上述代码中需要另外声明的有：</p>
                <figure class="highlight cpp">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="keyword">pcap_if_t</span>  * alldevs;       <span class="comment">//所有网络适配器</span></span><br><span class="line"><span class="keyword">pcap_if_t</span>  *d;					<span class="comment">//选中的网络适配器</span></span><br><span class="line"><span class="keyword">char</span> errbuf[PCAP_ERRBUF_SIZE];   <span class="comment">//错误缓冲区,大小为256</span></span><br><span class="line"><span class="keyword">pcap_t</span> *adhandle;           <span class="comment">//捕捉实例,是pcap_open返回的对象</span></span><br><span class="line"><span class="keyword">int</span> i = <span class="number">0</span>;                            <span class="comment">//适配器计数变量</span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <figure class="highlight cpp">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="function"><span class="keyword">char</span> *<span class="title">iptos</span><span class="params">(u_long in)</span></span>;       <span class="comment">//u_long即为 unsigned long</span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <figure class="highlight angelscript">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="comment">/* 将数字类型的IP地址转换成字符串类型的 */</span></span><br><span class="line">#define IPTOSBUFFERS    <span class="number">12</span></span><br><span class="line">char *iptos(u_long <span class="keyword">in</span>)</span><br><span class="line">&#123;</span><br><span class="line">    static char output[IPTOSBUFFERS][<span class="number">3</span>*<span class="number">4</span>+<span class="number">3</span>+<span class="number">1</span>];</span><br><span class="line">    static short which;</span><br><span class="line">    u_char *p;</span><br><span class="line"></span><br><span class="line">    p = (u_char *)&amp;<span class="keyword">in</span>;</span><br><span class="line">    which = (which + <span class="number">1</span> == IPTOSBUFFERS ? <span class="number">0</span> : which + <span class="number">1</span>);</span><br><span class="line">    sprintf_s(output[which], <span class="string">"%d.%d.%d.%d"</span>, p[<span class="number">0</span>], p[<span class="number">1</span>], p[<span class="number">2</span>], p[<span class="number">3</span>]);</span><br><span class="line">    <span class="keyword">return</span> output[which];</span><br><span class="line">&#125;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>到此程序应该会编译通过，可以试着编译一下运行。 GO ON… 接下来我们首先要用ifget方法获取自身的IP和子网掩码 函数声明：</p>
                <figure class="highlight cpp">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">ifget</span><span class="params">(<span class="keyword">pcap_if_t</span> *d, <span class="keyword">char</span> *ip_addr, <span class="keyword">char</span> *ip_netmask)</span></span>;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <figure class="highlight livescript">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="regexp">//获取IP和子网掩码赋值为ip_addr和ip_netmask</span></span><br><span class="line"><span class="regexp">void ifget(pcap_if_t *d, char *ip_addr, char *ip_netmask) &#123;</span></span><br><span class="line"><span class="regexp">	pcap_addr_t *a;</span></span><br><span class="line"><span class="regexp">	//</span>遍历所有的地址,a代表一个pcap_addr</span><br><span class="line">	<span class="keyword">for</span> (a = d-&gt;addresses; a; a = a-&gt;next) &#123;</span><br><span class="line">		<span class="keyword">switch</span> (a-&gt;addr-&gt;sa_family) &#123;</span><br><span class="line">		<span class="keyword">case</span> AF_INET:  <span class="regexp">//sa_family ：是2字节的地址家族，一般都是“AF_xxx”的形式。通常用的都是AF_INET。代表IPV4</span></span><br><span class="line"><span class="regexp">			if (a-&gt;addr) &#123;</span></span><br><span class="line"><span class="regexp">				char *ipstr;</span></span><br><span class="line"><span class="regexp">				//</span>将地址转化为字符串</span><br><span class="line">				ipstr = iptos<span class="function"><span class="params">(((struct sockaddr_in *) a-&gt;addr)-&gt;sin_addr.s_addr)</span>; //*<span class="title">ip_addr</span></span></span><br><span class="line"><span class="function">				<span class="title">printf</span><span class="params">(<span class="string">"ipstr:%s\n"</span>,ipstr)</span>;</span></span><br><span class="line"><span class="function">				<span class="title">memcpy</span><span class="params">(ip_addr, ipstr, <span class="number">16</span>)</span>;</span></span><br><span class="line"><span class="function">			&#125;</span></span><br><span class="line"><span class="function">			<span class="title">if</span> <span class="params">(a-&gt;netmask)</span> &#123;</span></span><br><span class="line"><span class="function">				<span class="title">char</span> *<span class="title">netmaskstr</span>;</span></span><br><span class="line"><span class="function">				<span class="title">netmaskstr</span> = <span class="title">iptos</span><span class="params">(((struct sockaddr_in *) a-&gt;netmask)-&gt;sin_addr.s_addr)</span>;</span></span><br><span class="line"><span class="function">				<span class="title">printf</span><span class="params">(<span class="string">"netmask:%s\n"</span>,netmaskstr)</span>;</span></span><br><span class="line"><span class="function">				<span class="title">memcpy</span><span class="params">(ip_netmask, netmaskstr, <span class="number">16</span>)</span>;</span></span><br><span class="line"><span class="function">			&#125;</span></span><br><span class="line"><span class="function">		<span class="title">case</span> <span class="title">AF_INET6</span>:</span></span><br><span class="line"><span class="function">			<span class="title">break</span>;</span></span><br><span class="line"><span class="function">		&#125;</span></span><br><span class="line"><span class="function">	&#125;</span></span><br><span class="line"><span class="function">&#125;</span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>main函数继续写，如下调用，之前声明的ip_addr和ip_netmask就已经被赋值了</p>
                <figure class="highlight brainfuck">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="comment">ifget(d</span><span class="string">,</span> <span class="comment">ip_addr</span><span class="string">,</span> <span class="comment">ip_netmask);</span> <span class="comment">//获取所选网卡的基本信息</span>--<span class="comment">掩码</span>--<span class="comment">IP地址</span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>到现在我们已经获取到了本机的IP和子网掩码，下一步发送一个ARP请求来获取自身的MAC地址 这个ARP请求的源IP地址就随便指定了，就相当于你构造了一个外来的ARP请求，本机捕获到了请求，然后发送回应给对方的数据包也被本机捕获到了并解析出来了。解析了自己发出去的数据包而已。 那么我们就声明一个函数并实现：</p>
                <figure class="highlight reasonml">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="built_in">int</span> <span class="constructor">GetSelfMac(<span class="params">pcap_t</span> <span class="operator">*</span><span class="params">adhandle</span>, <span class="params">const</span> <span class="params">char</span> <span class="operator">*</span><span class="params">ip_addr</span>, <span class="params">unsigned</span> <span class="params">char</span> <span class="operator">*</span><span class="params">ip_mac</span>)</span>;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <figure class="highlight cpp">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="comment">// 获取自己主机的MAC地址</span></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">GetSelfMac</span><span class="params">(<span class="keyword">pcap_t</span> *adhandle, <span class="keyword">const</span> <span class="keyword">char</span> *ip_addr, <span class="keyword">unsigned</span> <span class="keyword">char</span> *ip_mac)</span> </span>&#123;</span><br><span class="line">	<span class="keyword">unsigned</span> <span class="keyword">char</span> sendbuf[<span class="number">42</span>]; <span class="comment">//arp包结构大小</span></span><br><span class="line">	<span class="keyword">int</span> i = <span class="number">-1</span>;</span><br><span class="line">	<span class="keyword">int</span> res;</span><br><span class="line">	EthernetHeader eh; <span class="comment">//以太网帧头</span></span><br><span class="line">	Arpheader ah;  <span class="comment">//ARP帧头</span></span><br><span class="line">	<span class="class"><span class="keyword">struct</span> <span class="title">pcap_pkthdr</span> * <span class="title">pkt_header</span>;</span></span><br><span class="line">	<span class="keyword">const</span> u_char * pkt_data;</span><br><span class="line">	<span class="comment">//将已开辟内存空间 eh.dest_mac_add 的首 6个字节的值设为值 0xff。</span></span><br><span class="line">	<span class="built_in">memset</span>(eh.DestMAC, <span class="number">0xff</span>, <span class="number">6</span>); <span class="comment">//目的地址为全为广播地址</span></span><br><span class="line">	<span class="built_in">memset</span>(eh.SourMAC, <span class="number">0x0f</span>, <span class="number">6</span>);</span><br><span class="line">	<span class="built_in">memset</span>(ah.DestMacAdd, <span class="number">0x0f</span>, <span class="number">6</span>);</span><br><span class="line">	<span class="built_in">memset</span>(ah.SourceMacAdd, <span class="number">0x00</span>, <span class="number">6</span>);</span><br><span class="line">	<span class="comment">//htons将一个无符号短整型的主机数值转换为网络字节顺序</span></span><br><span class="line">	eh.EthType = htons(ETH_ARP);</span><br><span class="line">	ah.HardwareType= htons(ARP_HARDWARE);</span><br><span class="line">	ah.ProtocolType = htons(ETH_IP);</span><br><span class="line">	ah.HardwareAddLen = <span class="number">6</span>;</span><br><span class="line">	ah.ProtocolAddLen = <span class="number">4</span>;</span><br><span class="line">	ah.SourceIpAdd = inet_addr(<span class="string">"100.100.100.100"</span>); <span class="comment">//随便设的请求方ip</span></span><br><span class="line">	ah.OperationField = htons(ARP_REQUEST);</span><br><span class="line">	ah.DestIpAdd = inet_addr(ip_addr);</span><br><span class="line">	<span class="built_in">memset</span>(sendbuf, <span class="number">0</span>, <span class="keyword">sizeof</span>(sendbuf));</span><br><span class="line">	<span class="built_in">memcpy</span>(sendbuf, &amp;eh, <span class="keyword">sizeof</span>(eh));</span><br><span class="line">	<span class="built_in">memcpy</span>(sendbuf + <span class="keyword">sizeof</span>(eh), &amp;ah, <span class="keyword">sizeof</span>(ah));</span><br><span class="line">	<span class="built_in">printf</span>(<span class="string">"%s"</span>,sendbuf);</span><br><span class="line">	<span class="keyword">if</span> (pcap_sendpacket(adhandle, sendbuf, <span class="number">42</span>) == <span class="number">0</span>) &#123;</span><br><span class="line">		<span class="built_in">printf</span>(<span class="string">"\nPacketSend succeed\n"</span>);</span><br><span class="line">	&#125; <span class="keyword">else</span> &#123;</span><br><span class="line">		<span class="built_in">printf</span>(<span class="string">"PacketSendPacket in getmine Error: %d\n"</span>, GetLastError());</span><br><span class="line">		<span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="comment">//从interface或离线记录文件获取一个报文</span></span><br><span class="line">	<span class="comment">//pcap_next_ex(pcap_t* p,struct pcap_pkthdr** pkt_header,const u_char** pkt_data)</span></span><br><span class="line">	<span class="keyword">while</span> ((res = pcap_next_ex(adhandle, &amp;pkt_header, &amp;pkt_data)) &gt;= <span class="number">0</span>) &#123;</span><br><span class="line">		<span class="keyword">if</span> (*(<span class="keyword">unsigned</span> short *) (pkt_data + <span class="number">12</span>) == htons(ETH_ARP)</span><br><span class="line">				&amp;&amp; *(<span class="keyword">unsigned</span> short*) (pkt_data + <span class="number">20</span>) == htons(ARP_REPLY)</span><br><span class="line">				&amp;&amp; *(<span class="keyword">unsigned</span> <span class="keyword">long</span>*) (pkt_data + <span class="number">38</span>)</span><br><span class="line">						== inet_addr(<span class="string">"100.100.100.100"</span>)) &#123;</span><br><span class="line">			<span class="keyword">for</span> (i = <span class="number">0</span>; i &lt; <span class="number">6</span>; i++) &#123;</span><br><span class="line">				ip_mac[i] = *(<span class="keyword">unsigned</span> <span class="keyword">char</span> *) (pkt_data + <span class="number">22</span> + i);</span><br><span class="line">			&#125;</span><br><span class="line">			<span class="built_in">printf</span>(<span class="string">"获取自己主机的MAC地址成功!\n"</span>);</span><br><span class="line">			<span class="keyword">break</span>;</span><br><span class="line">		&#125;</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="keyword">if</span> (i == <span class="number">6</span>) &#123;</span><br><span class="line">		<span class="keyword">return</span> <span class="number">1</span>;</span><br><span class="line">	&#125; <span class="keyword">else</span> &#123;</span><br><span class="line">		<span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>其中我们需要定义一下常量如下</p>
                <figure class="highlight cpp">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="meta">#<span class="meta-keyword">define</span> ETH_ARP         0x0806  <span class="comment">//以太网帧类型表示后面数据的类型，对于ARP请求或应答来说，该字段的值为x0806</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> ARP_HARDWARE    1  <span class="comment">//硬件类型字段值为表示以太网地址</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> ETH_IP          0x0800  <span class="comment">//协议类型字段表示要映射的协议地址类型值为x0800表示IP地址</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> ARP_REQUEST     1   <span class="comment">//ARP请求</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> ARP_REPLY       2      <span class="comment">//ARP应答</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> HOSTNUM         255   <span class="comment">//主机数量</span></span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>另外发送ARP请求少不了帧头和ARP头的结构，我们需要声明出来，另外我们构建发送包需要再声明两个结构体sparam和gparam</p>
                <figure class="highlight cpp">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="comment">//帧头部结构体，共14字节</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">EthernetHeader</span></span></span><br><span class="line"><span class="class">&#123;</span></span><br><span class="line">    u_char DestMAC[<span class="number">6</span>];    <span class="comment">//目的MAC地址 6字节</span></span><br><span class="line">    u_char SourMAC[<span class="number">6</span>];   <span class="comment">//源MAC地址 6字节</span></span><br><span class="line">    u_short EthType;         <span class="comment">//上一层协议类型，如0x0800代表上一层是IP协议，0x0806为arp  2字节</span></span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="comment">//28字节ARP帧结构</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">Arpheader</span> &#123;</span></span><br><span class="line">	<span class="keyword">unsigned</span> short HardwareType; <span class="comment">//硬件类型</span></span><br><span class="line">	<span class="keyword">unsigned</span> short ProtocolType; <span class="comment">//协议类型</span></span><br><span class="line">	<span class="keyword">unsigned</span> <span class="keyword">char</span> HardwareAddLen; <span class="comment">//硬件地址长度</span></span><br><span class="line">	<span class="keyword">unsigned</span> <span class="keyword">char</span> ProtocolAddLen; <span class="comment">//协议地址长度</span></span><br><span class="line">	<span class="keyword">unsigned</span> short OperationField; <span class="comment">//操作字段</span></span><br><span class="line">	<span class="keyword">unsigned</span> <span class="keyword">char</span> SourceMacAdd[<span class="number">6</span>]; <span class="comment">//源mac地址</span></span><br><span class="line">	<span class="keyword">unsigned</span> <span class="keyword">long</span> SourceIpAdd; <span class="comment">//源ip地址</span></span><br><span class="line">	<span class="keyword">unsigned</span> <span class="keyword">char</span> DestMacAdd[<span class="number">6</span>]; <span class="comment">//目的mac地址</span></span><br><span class="line">	<span class="keyword">unsigned</span> <span class="keyword">long</span> DestIpAdd; <span class="comment">//目的ip地址</span></span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="comment">//arp包结构</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">ArpPacket</span> &#123;</span></span><br><span class="line">	EthernetHeader ed;</span><br><span class="line">	Arpheader ah;</span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">sparam</span> &#123;</span></span><br><span class="line">	<span class="keyword">pcap_t</span> *adhandle;</span><br><span class="line">	<span class="keyword">char</span> *ip;</span><br><span class="line">	<span class="keyword">unsigned</span> <span class="keyword">char</span> *mac;</span><br><span class="line">	<span class="keyword">char</span> *netmask;</span><br><span class="line">&#125;;</span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">gparam</span> &#123;</span></span><br><span class="line">	<span class="keyword">pcap_t</span> *adhandle;</span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">sparam</span> <span class="title">sp</span>;</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">gparam</span> <span class="title">gp</span>;</span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>到现在代码也是完整可以运行的，如果有问题请检查上述代码完整性和位置。 可能出现的BUG： 只显示ARP发送成功，没有接受到并解析打印。可能的原因是帧构造有问题，字节没有对齐，有偏差，像#define一样 写入如下代码：</p>
                <figure class="highlight cpp">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="meta">#<span class="meta-keyword">pragma</span> pack(1)  <span class="comment">//按一个字节内存对齐</span></span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>GO ON.. 获取到了自身的MAC地址之后，就可以在本机上构建ARP广播请求，向局域网内的所有主机发送ARP请求，得到回应之后解析回应的数据包并进行解析，得到对方的MAC地址。在这里我们需要开启两个线程，一个用来发送一个用来接收。好，我们继续.. 先声明两个线程</p>
                <figure class="highlight lasso">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="keyword">HANDLE</span> sendthread;      <span class="comment">//发送ARP包线程</span></span><br><span class="line"><span class="keyword">HANDLE</span> recvthread;       <span class="comment">//接受ARP包线程</span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>在main方法中继续写，对sp和gp两个ARP请求所需要的结构体进行赋值。赋值什么？就是你之前用ifget获取来的IP地址和子网掩码以及用getSelfMac获取来的MAC地址。</p>
                <figure class="highlight abnf">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">sp.adhandle = adhandle<span class="comment">;</span></span><br><span class="line">	sp.ip = ip_addr<span class="comment">;</span></span><br><span class="line">	sp.mac = ip_mac<span class="comment">;</span></span><br><span class="line">	sp.netmask = ip_netmask<span class="comment">;</span></span><br><span class="line">	gp.adhandle = adhandle<span class="comment">;</span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>接下来直接创建两个线程，一个是发送一个接受，分别调用两个方法。</p>
                <figure class="highlight lisp">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">sendthread = CreateThread(<span class="name">NULL</span>, <span class="number">0</span>, (<span class="name">LPTHREAD_START_ROUTINE</span>) SendArpPacket,</span><br><span class="line">			<span class="symbol">&amp;sp</span>, <span class="number">0</span>, NULL)<span class="comment">;</span></span><br><span class="line">	recvthread = CreateThread(<span class="name">NULL</span>, <span class="number">0</span>, (<span class="name">LPTHREAD_START_ROUTINE</span>) GetLivePC, <span class="symbol">&amp;gp</span>,</span><br><span class="line">			<span class="number">0</span>, NULL)<span class="comment">;</span></span><br><span class="line">	printf(<span class="string">"\nlistening on 网卡%d ...\n"</span>, i)<span class="comment">;</span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>那么发送数据包的方法和接收解析数据包的方法怎样实现呢？ 发送数据包，发送数据包先对结构体数据进行赋值，就像getSelfMac方法一样，然后声明了一个buffer用来存储每一个字节内容。 利用memset方法对buffer进行赋值。再利用一个for循环对255个主机进行发送，指定他们的IP地址。另外定义了一个flag,当发送成功之后将flag设置为1</p>
                <figure class="highlight cpp">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="comment">/* 向局域网内所有可能的IP地址发送ARP请求包线程 */</span></span><br><span class="line"><span class="function">DWORD WINAPI <span class="title">SendArpPacket</span><span class="params">(LPVOID lpParameter)</span> <span class="comment">//(pcap_t *adhandle,char *ip,unsigned char *mac,char *netmask)</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">	sparam *spara = (sparam *) lpParameter;</span><br><span class="line">	<span class="keyword">pcap_t</span> *adhandle = spara-&gt;adhandle;</span><br><span class="line">	<span class="keyword">char</span> *ip = spara-&gt;ip;</span><br><span class="line">	<span class="keyword">unsigned</span> <span class="keyword">char</span> *mac = spara-&gt;mac;</span><br><span class="line">	<span class="keyword">char</span> *netmask = spara-&gt;netmask;</span><br><span class="line">	<span class="built_in">printf</span>(<span class="string">"ip_mac:%02x-%02x-%02x-%02x-%02x-%02x\n"</span>, mac[<span class="number">0</span>], mac[<span class="number">1</span>], mac[<span class="number">2</span>],</span><br><span class="line">			mac[<span class="number">3</span>], mac[<span class="number">4</span>], mac[<span class="number">5</span>]);</span><br><span class="line">	<span class="built_in">printf</span>(<span class="string">"自身的IP地址为:%s\n"</span>, ip);</span><br><span class="line">	<span class="built_in">printf</span>(<span class="string">"地址掩码NETMASK为:%s\n"</span>, netmask);</span><br><span class="line">	<span class="built_in">printf</span>(<span class="string">"\n"</span>);</span><br><span class="line">	<span class="keyword">unsigned</span> <span class="keyword">char</span> sendbuf[<span class="number">42</span>]; <span class="comment">//arp包结构大小</span></span><br><span class="line">	EthernetHeader eh;</span><br><span class="line">	Arpheader ah;</span><br><span class="line">	<span class="comment">//赋值MAC地址</span></span><br><span class="line">	<span class="built_in">memset</span>(eh.DestMAC, <span class="number">0xff</span>, <span class="number">6</span>);       <span class="comment">//目的地址为全为广播地址</span></span><br><span class="line">	<span class="built_in">memcpy</span>(eh.SourMAC, mac, <span class="number">6</span>);</span><br><span class="line">	<span class="built_in">memcpy</span>(ah.SourceMacAdd, mac, <span class="number">6</span>);</span><br><span class="line">	<span class="built_in">memset</span>(ah.DestMacAdd, <span class="number">0x00</span>, <span class="number">6</span>);</span><br><span class="line">	eh.EthType = htons(ETH_ARP);</span><br><span class="line">	ah.HardwareType = htons(ARP_HARDWARE);</span><br><span class="line">	ah.ProtocolType = htons(ETH_IP);</span><br><span class="line">	ah.HardwareAddLen = <span class="number">6</span>;</span><br><span class="line">	ah.ProtocolAddLen = <span class="number">4</span>;</span><br><span class="line">	ah.SourceIpAdd = inet_addr(ip); <span class="comment">//请求方的IP地址为自身的IP地址</span></span><br><span class="line">	ah.OperationField = htons(ARP_REQUEST);</span><br><span class="line">	<span class="comment">//向局域网内广播发送arp包</span></span><br><span class="line">	<span class="keyword">unsigned</span> <span class="keyword">long</span> myip = inet_addr(ip);</span><br><span class="line">	<span class="keyword">unsigned</span> <span class="keyword">long</span> mynetmask = inet_addr(netmask);</span><br><span class="line">	<span class="keyword">unsigned</span> <span class="keyword">long</span> hisip = htonl((myip &amp; mynetmask));</span><br><span class="line">	<span class="comment">//向255个主机发送</span></span><br><span class="line">	<span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number">0</span>; i &lt; HOSTNUM; i++) &#123;</span><br><span class="line">		ah.DestIpAdd = htonl(hisip + i);</span><br><span class="line">		<span class="comment">//构造一个ARP请求</span></span><br><span class="line">		<span class="built_in">memset</span>(sendbuf, <span class="number">0</span>, <span class="keyword">sizeof</span>(sendbuf));</span><br><span class="line">		<span class="built_in">memcpy</span>(sendbuf, &amp;eh, <span class="keyword">sizeof</span>(eh));</span><br><span class="line">		<span class="built_in">memcpy</span>(sendbuf + <span class="keyword">sizeof</span>(eh), &amp;ah, <span class="keyword">sizeof</span>(ah));</span><br><span class="line">		<span class="comment">//如果发送成功</span></span><br><span class="line">		<span class="keyword">if</span> (pcap_sendpacket(adhandle, sendbuf, <span class="number">42</span>) == <span class="number">0</span>) &#123;</span><br><span class="line">			<span class="comment">//printf("\nPacketSend succeed\n");</span></span><br><span class="line">		&#125; <span class="keyword">else</span> &#123;</span><br><span class="line">			<span class="built_in">printf</span>(<span class="string">"PacketSendPacket in getmine Error: %d\n"</span>, GetLastError());</span><br><span class="line">		&#125;</span><br><span class="line">		Sleep(<span class="number">50</span>);</span><br><span class="line">	&#125;</span><br><span class="line">	Sleep(<span class="number">1000</span>);</span><br><span class="line">	flag = TRUE;</span><br><span class="line">	<span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>注: 此函数和flag变量在前面别忘了声明一下… 然后是接收数据包并打印MAC地址:</p>
                <figure class="highlight cpp">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="comment">/* 分析截留的数据包获取活动的主机IP地址 */</span></span><br><span class="line"><span class="function">DWORD WINAPI <span class="title">GetLivePC</span><span class="params">(LPVOID lpParameter)</span> <span class="comment">//(pcap_t *adhandle)</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">	gparam *gpara = (gparam *) lpParameter;</span><br><span class="line">	<span class="keyword">pcap_t</span> *adhandle = gpara-&gt;adhandle;</span><br><span class="line">	<span class="keyword">int</span> res;</span><br><span class="line">	<span class="keyword">unsigned</span> <span class="keyword">char</span> Mac[<span class="number">6</span>];</span><br><span class="line">	<span class="class"><span class="keyword">struct</span> <span class="title">pcap_pkthdr</span> * <span class="title">pkt_header</span>;</span></span><br><span class="line">	<span class="keyword">const</span> u_char * pkt_data;</span><br><span class="line">	<span class="keyword">while</span> (<span class="literal">true</span>) &#123;</span><br><span class="line">		<span class="keyword">if</span> (flag) &#123;</span><br><span class="line">			<span class="built_in">printf</span>(<span class="string">"获取MAC地址完毕,请输入你要发送对方的IP地址:\n"</span>);</span><br><span class="line">			<span class="keyword">break</span>;</span><br><span class="line">		&#125;</span><br><span class="line">		<span class="keyword">if</span> ((res = pcap_next_ex(adhandle, &amp;pkt_header, &amp;pkt_data)) &gt;= <span class="number">0</span>) &#123;</span><br><span class="line">			<span class="keyword">if</span> (*(<span class="keyword">unsigned</span> short *) (pkt_data + <span class="number">12</span>) == htons(ETH_ARP)) &#123;</span><br><span class="line">				ArpPacket *recv = (ArpPacket *) pkt_data;</span><br><span class="line">				<span class="keyword">if</span> (*(<span class="keyword">unsigned</span> short *) (pkt_data + <span class="number">20</span>) == htons(ARP_REPLY)) &#123;</span><br><span class="line">					<span class="built_in">printf</span>(<span class="string">"-------------------------------------------\n"</span>);</span><br><span class="line">					<span class="built_in">printf</span>(<span class="string">"IP地址:%d.%d.%d.%d   MAC地址:"</span>,</span><br><span class="line">						     recv-&gt;ah.SourceIpAdd &amp; <span class="number">255</span>,</span><br><span class="line">							 recv-&gt;ah.SourceIpAdd &gt;&gt; <span class="number">8</span> &amp; <span class="number">255</span>,</span><br><span class="line">							 recv-&gt;ah.SourceIpAdd &gt;&gt; <span class="number">16</span> &amp; <span class="number">255</span>,</span><br><span class="line">							 recv-&gt;ah.SourceIpAdd &gt;&gt; <span class="number">24</span> &amp; <span class="number">255</span>);</span><br><span class="line">					<span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number">0</span>; i &lt; <span class="number">6</span>; i++) &#123;</span><br><span class="line">						Mac[i] = *(<span class="keyword">unsigned</span> <span class="keyword">char</span> *) (pkt_data + <span class="number">22</span> + i);</span><br><span class="line">						<span class="built_in">printf</span>(<span class="string">"%02x"</span>, Mac[i]);</span><br><span class="line">					&#125;</span><br><span class="line">					<span class="built_in">printf</span>(<span class="string">"\n"</span>);</span><br><span class="line">				&#125;</span><br><span class="line">			&#125;</span><br><span class="line">		&#125;</span><br><span class="line">		Sleep(<span class="number">10</span>);</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>以上暂告一段落，通过整合以上代码，我们可以得到如下运行结果：</p>
                <figure class="highlight asciidoc">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">--------------------------------------------------</span><br><span class="line">number:1</span><br><span class="line">name:rpcap://\Device\NPF<span class="emphasis">_&#123;5AC72F8D-019C-4003-B51B-</span></span><br><span class="line"><span class="emphasis">description:Network adapter 'Microsoft' on local h</span></span><br><span class="line"><span class="emphasis">        Loopback: no</span></span><br><span class="line"><span class="emphasis">Address Family Name:AF_</span>INET6</span><br><span class="line">this is an IPV6 address</span><br><span class="line">Address Family Name:AF<span class="emphasis">_INET6</span></span><br><span class="line"><span class="emphasis">this is an IPV6 address</span></span><br><span class="line"><span class="emphasis">--------------------------------------------------</span></span><br><span class="line"><span class="emphasis">number:2</span></span><br><span class="line"><span class="emphasis">name:rpcap://\Device\NPF_</span>&#123;C17EB3F6-1E86-40E5-8790-</span><br><span class="line">description:Network adapter <span class="emphasis">'Microsoft'</span> on local h</span><br><span class="line"><span class="code">        Loopback: no</span></span><br><span class="line">Address Family Name:AF<span class="emphasis">_INET6</span></span><br><span class="line"><span class="emphasis">this is an IPV6 address</span></span><br><span class="line"><span class="emphasis">Address Family Name:AF_</span>INET</span><br><span class="line">Address:192.168.95.1</span><br><span class="line"><span class="code">        Netmask: 255.255.255.0</span></span><br><span class="line"><span class="code">        Broadcast Address: 255.255.255.255</span></span><br><span class="line">--------------------------------------------------</span><br><span class="line">number:3</span><br><span class="line">name:rpcap://\Device\NPF<span class="emphasis">_&#123;33E23A2F-F791-409B-8452-</span></span><br><span class="line"><span class="emphasis">description:Network adapter 'Qualcomm Atheros Ar81</span></span><br><span class="line"><span class="emphasis">oller' on local host</span></span><br><span class="line"><span class="emphasis">        Loopback: no</span></span><br><span class="line"><span class="emphasis">Address Family Name:AF_</span>INET6</span><br><span class="line">this is an IPV6 address</span><br><span class="line">Address Family Name:AF<span class="emphasis">_INET6</span></span><br><span class="line"><span class="emphasis">this is an IPV6 address</span></span><br><span class="line"><span class="emphasis">Address Family Name:AF_</span>INET6</span><br><span class="line">this is an IPV6 address</span><br><span class="line">Address Family Name:AF<span class="emphasis">_INET</span></span><br><span class="line"><span class="emphasis">Address:121.250.216.237</span></span><br><span class="line"><span class="emphasis">        Netmask: 255.255.255.0</span></span><br><span class="line"><span class="emphasis">        Broadcast Address: 255.255.255.255</span></span><br><span class="line"><span class="emphasis">--------------------------------------------------</span></span><br><span class="line"><span class="emphasis">number:4</span></span><br><span class="line"><span class="emphasis">name:rpcap://\Device\NPF_</span>&#123;DCCF036F-A9A8-4225-B980-</span><br><span class="line">description:Network adapter <span class="emphasis">'Microsoft'</span> on local h</span><br><span class="line"><span class="code">        Loopback: no</span></span><br><span class="line">Address Family Name:AF<span class="emphasis">_INET6</span></span><br><span class="line"><span class="emphasis">this is an IPV6 address</span></span><br><span class="line"><span class="emphasis">Address Family Name:AF_</span>INET6</span><br><span class="line">this is an IPV6 address</span><br><span class="line">--------------------------------------------------</span><br><span class="line">number:5</span><br><span class="line">name:rpcap://\Device\NPF<span class="emphasis">_&#123;D62A0060-F424-46FC-83A5-</span></span><br><span class="line"><span class="emphasis">description:Network adapter 'Microsoft' on local h</span></span><br><span class="line"><span class="emphasis">        Loopback: no</span></span><br><span class="line"><span class="emphasis">Address Family Name:AF_</span>INET6</span><br><span class="line">this is an IPV6 address</span><br><span class="line">Address Family Name:AF<span class="emphasis">_INET</span></span><br><span class="line"><span class="emphasis">Address:192.168.191.1</span></span><br><span class="line"><span class="emphasis">        Netmask: 255.255.255.0</span></span><br><span class="line"><span class="emphasis">        Broadcast Address: 255.255.255.255</span></span><br><span class="line"><span class="emphasis">--------------------------------------------------</span></span><br><span class="line"><span class="emphasis">number:6</span></span><br><span class="line"><span class="emphasis">name:rpcap://\Device\NPF_</span>&#123;B5224A53-8450-4537-AB3B-</span><br><span class="line">description:Network adapter <span class="emphasis">'Microsoft'</span> on local h</span><br><span class="line"><span class="code">        Loopback: no</span></span><br><span class="line">Address Family Name:AF<span class="emphasis">_INET6</span></span><br><span class="line"><span class="emphasis">this is an IPV6 address</span></span><br><span class="line"><span class="emphasis">Address Family Name:AF_</span>INET</span><br><span class="line">Address:192.168.191.2</span><br><span class="line"><span class="code">        Netmask: 255.255.255.0</span></span><br><span class="line"><span class="code">        Broadcast Address: 255.255.255.255</span></span><br><span class="line">Enter the interface number(1-6):3</span><br><span class="line"></span><br><span class="line">ipstr:121.250.216.237</span><br><span class="line">netmask:255.255.255.0</span><br><span class="line"></span><br><span class="line">PacketSend succeed</span><br><span class="line">获取自己主机的MAC地址成功!</span><br><span class="line"></span><br><span class="line">listening on 网卡2 ...</span><br><span class="line">ip<span class="emphasis">_mac:dc-0e-a1-ec-53-c3</span></span><br><span class="line"><span class="emphasis">自身的IP地址为:121.250.216.237</span></span><br><span class="line"><span class="emphasis">地址掩码NETMASK为:255.255.255.0</span></span><br><span class="line"><span class="emphasis"></span></span><br><span class="line"><span class="emphasis">请按任意键继续. . . ------------------------------</span></span><br><span class="line"><span class="emphasis">IP地址:121.250.216.1   MAC地址:000fe28e6100</span></span><br><span class="line"><span class="emphasis">-------------------------------------------</span></span><br><span class="line"><span class="emphasis">IP地址:121.250.216.3   MAC地址:089e012d20d5</span></span><br><span class="line"><span class="emphasis">-------------------------------------------</span></span><br><span class="line"><span class="emphasis">IP地址:121.250.216.5   MAC地址:5404a6af5f2d</span></span><br><span class="line"><span class="emphasis">-------------------------------------------</span></span><br><span class="line"><span class="emphasis">IP地址:121.250.216.6   MAC地址:28d244248d81</span></span><br><span class="line"><span class="emphasis">-------------------------------------------</span></span><br><span class="line"><span class="emphasis">IP地址:121.250.216.7   MAC地址:80fa5b0283f3</span></span><br><span class="line"><span class="emphasis">-------------------------------------------</span></span><br><span class="line"><span class="emphasis">IP地址:121.250.216.8   MAC地址:14dae9005b9e</span></span><br><span class="line"><span class="emphasis">-------------------------------------------</span></span><br><span class="line"><span class="emphasis">IP地址:121.250.216.9   MAC地址:b82a72bf8bce</span></span><br><span class="line"><span class="emphasis">-------------------------------------------</span></span><br><span class="line"><span class="emphasis">IP地址:121.250.216.12   MAC地址:84c9b2fefeed</span></span><br><span class="line"><span class="emphasis">-------------------------------------------</span></span><br><span class="line"><span class="emphasis">IP地址:121.250.216.15   MAC地址:28d2440b4b1b</span></span><br><span class="line"><span class="emphasis">-------------------------------------------</span></span><br><span class="line"><span class="emphasis">IP地址:121.250.216.16   MAC地址:bcee7b969beb</span></span><br><span class="line"><span class="emphasis">-------------------------------------------</span></span><br><span class="line"><span class="emphasis">........此处省略一万字....</span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>接下来我们让用户输入要发送的IP地址和要发送的数据</p>
                <figure class="highlight perl">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">u_int ip1,ip2,ip3,ip4;</span><br><span class="line">		scanf_s(<span class="string">"%d.%d.%d.%d"</span>,&amp;ip1,&amp;ip2,&amp;ip3,&amp;ip4);</span><br><span class="line">		<span class="keyword">printf</span>(<span class="string">"请输入你要发送的内容:\n"</span>);</span><br><span class="line">		getchar();</span><br><span class="line">		gets_s(TcpData);</span><br><span class="line">		<span class="keyword">printf</span>(<span class="string">"要发送的内容:%s\n"</span>,TcpData);</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>声明一下TcpData</p>
                <figure class="highlight scss">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">char TcpData<span class="selector-attr">[20]</span>;   <span class="comment">//发送内容</span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>接下来就是重头戏了，需要声明各种结构体，我们发送的是TCP数据，这样，TCP的TcpData 就作为真正的内容，然后在前面加上TCP头，IP头，帧头，还有校验和要正确。 最后构成一个完整的帧，那么另外声明的结构体如下，前面代码声明过的帧头部结构体就去掉了。</p>
                <figure class="highlight objectivec">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="comment">//IP地址格式</span></span><br><span class="line"><span class="keyword">struct</span> IpAddress</span><br><span class="line">&#123;</span><br><span class="line">    u_char byte1;</span><br><span class="line">    u_char byte2;</span><br><span class="line">    u_char byte3;</span><br><span class="line">    u_char byte4;</span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="comment">//帧头部结构体，共14字节</span></span><br><span class="line"><span class="keyword">struct</span> EthernetHeader</span><br><span class="line">&#123;</span><br><span class="line">    u_char DestMAC[<span class="number">6</span>];    <span class="comment">//目的MAC地址 6字节</span></span><br><span class="line">    u_char SourMAC[<span class="number">6</span>];   <span class="comment">//源MAC地址 6字节</span></span><br><span class="line">    u_short EthType;         <span class="comment">//上一层协议类型，如0x0800代表上一层是IP协议，0x0806为arp  2字节</span></span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="comment">//IP头部结构体，共20字节</span></span><br><span class="line"><span class="keyword">struct</span> IpHeader</span><br><span class="line">&#123;</span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">char</span> Version_HLen;   <span class="comment">//版本信息4位 ，头长度4位 1字节</span></span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">char</span> TOS;                    <span class="comment">//服务类型    1字节</span></span><br><span class="line">    <span class="keyword">short</span> Length;                              <span class="comment">//数据包长度 2字节</span></span><br><span class="line">    <span class="keyword">short</span> Ident;                                 <span class="comment">//数据包标识  2字节</span></span><br><span class="line">    <span class="keyword">short</span> Flags_Offset;                    <span class="comment">//标志3位，片偏移13位  2字节</span></span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">char</span> TTL;                   <span class="comment">//存活时间  1字节</span></span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">char</span> Protocol;          <span class="comment">//协议类型  1字节</span></span><br><span class="line">    <span class="keyword">short</span> Checksum;                       <span class="comment">//首部校验和 2字节</span></span><br><span class="line">	IpAddress SourceAddr;       <span class="comment">//源IP地址   4字节</span></span><br><span class="line">	IpAddress DestinationAddr; <span class="comment">//目的IP地址  4字节</span></span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="comment">//TCP头部结构体，共20字节</span></span><br><span class="line"><span class="keyword">struct</span> TcpHeader</span><br><span class="line">&#123;</span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">short</span> SrcPort;                        <span class="comment">//源端口号  2字节</span></span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">short</span> DstPort;                        <span class="comment">//目的端口号 2字节</span></span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">int</span> SequenceNum;               <span class="comment">//序号  4字节</span></span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">int</span> Acknowledgment;         <span class="comment">//确认号  4字节</span></span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">char</span> HdrLen;                         <span class="comment">//首部长度4位，保留位6位 共10位</span></span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">char</span> Flags;                              <span class="comment">//标志位6位</span></span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">short</span> AdvertisedWindow;  <span class="comment">//窗口大小16位 2字节</span></span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">short</span> Checksum;                  <span class="comment">//校验和16位   2字节</span></span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">short</span> UrgPtr;						  <span class="comment">//紧急指针16位   2字节</span></span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="comment">//TCP伪首部结构体 12字节</span></span><br><span class="line"><span class="keyword">struct</span> PsdTcpHeader</span><br><span class="line">&#123;</span><br><span class="line">	IpAddress SourceAddr;                     <span class="comment">//源IP地址  4字节</span></span><br><span class="line">	IpAddress DestinationAddr;             <span class="comment">//目的IP地址 4字节</span></span><br><span class="line">    <span class="keyword">char</span> Zero;                                                    <span class="comment">//填充位  1字节</span></span><br><span class="line">    <span class="keyword">char</span> Protcol;                                               <span class="comment">//协议号  1字节</span></span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">short</span> TcpLen;                           <span class="comment">//TCP包长度 2字节</span></span><br><span class="line">&#125;;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>继续main函数中对各种结构体的数据进行初始化赋值，并计算校验和。</p>
                <figure class="highlight arduino">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="comment">//结构体初始化为0序列</span></span><br><span class="line">		<span class="built_in">memset</span>(&amp;ethernet, <span class="number">0</span>, <span class="keyword">sizeof</span>(ethernet));</span><br><span class="line">		BYTE destmac[<span class="number">8</span>];</span><br><span class="line">		<span class="comment">//目的MAC地址,此处没有对帧的MAC地址进行赋值，因为网卡设置的混杂模式，可以接受经过该网卡的所有帧。当然最好的方法是赋值为ARP刚才获取到的MAC地址，当然不赋值也可以捕捉到并解析，在此处仅做下说明。</span></span><br><span class="line">		destmac[<span class="number">0</span>] = <span class="number">0x00</span>;</span><br><span class="line">		destmac[<span class="number">1</span>] = <span class="number">0x11</span>;</span><br><span class="line">		destmac[<span class="number">2</span>] = <span class="number">0x22</span>;</span><br><span class="line">		destmac[<span class="number">3</span>] = <span class="number">0x33</span>;</span><br><span class="line">		destmac[<span class="number">4</span>] = <span class="number">0x44</span>;</span><br><span class="line">		destmac[<span class="number">5</span>] = <span class="number">0x55</span>;</span><br><span class="line">		<span class="comment">//赋值目的MAC地址</span></span><br><span class="line">		<span class="built_in">memcpy</span>(ethernet.DestMAC, destmac, <span class="number">6</span>);</span><br><span class="line">		BYTE hostmac[<span class="number">8</span>];</span><br><span class="line">		<span class="comment">//源MAC地址</span></span><br><span class="line">		hostmac[<span class="number">0</span>] = <span class="number">0x00</span>;</span><br><span class="line">		hostmac[<span class="number">1</span>] = <span class="number">0x1a</span>;</span><br><span class="line">		hostmac[<span class="number">2</span>] = <span class="number">0x4d</span>;</span><br><span class="line">		hostmac[<span class="number">3</span>] = <span class="number">0x70</span>;</span><br><span class="line">		hostmac[<span class="number">4</span>] = <span class="number">0xa3</span>;</span><br><span class="line">		hostmac[<span class="number">5</span>] = <span class="number">0x89</span>;</span><br><span class="line">		<span class="comment">//赋值源MAC地址</span></span><br><span class="line">		<span class="built_in">memcpy</span>(ethernet.SourMAC, hostmac, <span class="number">6</span>);</span><br><span class="line">		<span class="comment">//上层协议类型,0x0800代表IP协议</span></span><br><span class="line">		ethernet.EthType = htons(<span class="number">0x0800</span>);</span><br><span class="line">		<span class="comment">//赋值SendBuffer</span></span><br><span class="line">		<span class="built_in">memcpy</span>(&amp;SendBuffer, ðernet, <span class="keyword">sizeof</span>(struct EthernetHeader));</span><br><span class="line">		<span class="comment">//赋值IP头部信息</span></span><br><span class="line">		ip.Version_HLen = <span class="number">0x45</span>;</span><br><span class="line">		ip.TOS = <span class="number">0</span>;</span><br><span class="line">		ip.Length = htons(<span class="keyword">sizeof</span>(struct IpHeader) + <span class="keyword">sizeof</span>(struct TcpHeader) + <span class="built_in">strlen</span>(TcpData));</span><br><span class="line">		ip.Ident = htons(<span class="number">1</span>);</span><br><span class="line">		ip.Flags_Offset = <span class="number">0</span>;</span><br><span class="line">		ip.TTL = <span class="number">128</span>;</span><br><span class="line">		ip.Protocol = <span class="number">6</span>;</span><br><span class="line">		ip.Checksum = <span class="number">0</span>;</span><br><span class="line">		<span class="comment">//源IP地址</span></span><br><span class="line">		ip.SourceAddr.byte1 = <span class="number">127</span>;</span><br><span class="line">		ip.SourceAddr.byte2 = <span class="number">0</span>;</span><br><span class="line">		ip.SourceAddr.byte3 = <span class="number">0</span>;</span><br><span class="line">		ip.SourceAddr.byte4 = <span class="number">1</span>;</span><br><span class="line">		<span class="comment">//目的IP地址</span></span><br><span class="line">		ip.DestinationAddr.byte1 = ip1;</span><br><span class="line">		ip.DestinationAddr.byte2 = ip2;</span><br><span class="line">		ip.DestinationAddr.byte3 = ip3;</span><br><span class="line">		ip.DestinationAddr.byte4 = ip4;</span><br><span class="line">		<span class="comment">//赋值SendBuffer</span></span><br><span class="line">		<span class="built_in">memcpy</span>(&amp;SendBuffer[<span class="keyword">sizeof</span>(struct EthernetHeader)], &amp;ip, <span class="number">20</span>);</span><br><span class="line">		<span class="comment">//赋值TCP头部内容</span></span><br><span class="line">		tcp.DstPort = htons(<span class="number">102</span>);</span><br><span class="line">		tcp.SrcPort = htons(<span class="number">1000</span>);</span><br><span class="line">		tcp.SequenceNum = htonl(<span class="number">11</span>);</span><br><span class="line">		tcp.Acknowledgment = <span class="number">0</span>;</span><br><span class="line">		tcp.HdrLen = <span class="number">0x50</span>;</span><br><span class="line">		tcp.Flags = <span class="number">0x18</span>;</span><br><span class="line">		tcp.AdvertisedWindow = htons(<span class="number">512</span>);</span><br><span class="line">		tcp.UrgPtr = <span class="number">0</span>;</span><br><span class="line">		tcp.Checksum = <span class="number">0</span>;</span><br><span class="line">		<span class="comment">//赋值SendBuffer</span></span><br><span class="line">		<span class="built_in">memcpy</span>(&amp;SendBuffer[<span class="keyword">sizeof</span>(struct EthernetHeader) + <span class="number">20</span>], &amp;tcp, <span class="number">20</span>);</span><br><span class="line">		<span class="comment">//赋值伪首部</span></span><br><span class="line">		ptcp.SourceAddr = ip.SourceAddr;</span><br><span class="line">		ptcp.DestinationAddr = ip.DestinationAddr;</span><br><span class="line">		ptcp.Zero = <span class="number">0</span>;</span><br><span class="line">		ptcp.Protcol = <span class="number">6</span>;</span><br><span class="line">		ptcp.TcpLen = htons(<span class="keyword">sizeof</span>(struct TcpHeader) + <span class="built_in">strlen</span>(TcpData));</span><br><span class="line">		<span class="comment">//声明临时存储变量，用来计算校验和</span></span><br><span class="line">		<span class="keyword">char</span> TempBuffer[<span class="number">65535</span>];</span><br><span class="line">		<span class="built_in">memcpy</span>(TempBuffer, &amp;ptcp, <span class="keyword">sizeof</span>(struct PsdTcpHeader));</span><br><span class="line">		<span class="built_in">memcpy</span>(TempBuffer + <span class="keyword">sizeof</span>(struct PsdTcpHeader), &amp;tcp, <span class="keyword">sizeof</span>(struct TcpHeader));</span><br><span class="line">		<span class="built_in">memcpy</span>(TempBuffer + <span class="keyword">sizeof</span>(struct PsdTcpHeader) + <span class="keyword">sizeof</span>(struct TcpHeader), TcpData, <span class="built_in">strlen</span>(TcpData));</span><br><span class="line">		<span class="comment">//计算TCP的校验和</span></span><br><span class="line">		tcp.Checksum = checksum((USHORT*)(TempBuffer), <span class="keyword">sizeof</span>(struct PsdTcpHeader) + <span class="keyword">sizeof</span>(struct TcpHeader) + <span class="built_in">strlen</span>(TcpData));</span><br><span class="line">		<span class="comment">//重新把SendBuffer赋值，因为此时校验和已经改变，赋值新的</span></span><br><span class="line">		<span class="built_in">memcpy</span>(SendBuffer + <span class="keyword">sizeof</span>(struct EthernetHeader) + <span class="keyword">sizeof</span>(struct IpHeader), &amp;tcp, <span class="keyword">sizeof</span>(struct TcpHeader));</span><br><span class="line">		<span class="built_in">memcpy</span>(SendBuffer + <span class="keyword">sizeof</span>(struct EthernetHeader) + <span class="keyword">sizeof</span>(struct IpHeader) + <span class="keyword">sizeof</span>(struct TcpHeader), TcpData, <span class="built_in">strlen</span>(TcpData));</span><br><span class="line">		<span class="comment">//初始化TempBuffer为0序列，存储变量来计算IP校验和</span></span><br><span class="line">		<span class="built_in">memset</span>(TempBuffer, <span class="number">0</span>, <span class="keyword">sizeof</span>(TempBuffer));</span><br><span class="line">		<span class="built_in">memcpy</span>(TempBuffer, &amp;ip, <span class="keyword">sizeof</span>(struct IpHeader));</span><br><span class="line">		<span class="comment">//计算IP校验和</span></span><br><span class="line">		ip.Checksum = checksum((USHORT*)(TempBuffer), <span class="keyword">sizeof</span>(struct IpHeader));</span><br><span class="line">		<span class="comment">//重新把SendBuffer赋值，IP校验和已经改变</span></span><br><span class="line">		<span class="built_in">memcpy</span>(SendBuffer + <span class="keyword">sizeof</span>(struct EthernetHeader), &amp;ip, <span class="keyword">sizeof</span>(struct IpHeader));</span><br><span class="line">		<span class="comment">//发送序列的长度</span></span><br><span class="line">		<span class="keyword">int</span> <span class="built_in">size</span> = <span class="keyword">sizeof</span>(struct EthernetHeader) + <span class="keyword">sizeof</span>(struct IpHeader) + <span class="keyword">sizeof</span>(struct TcpHeader) + <span class="built_in">strlen</span>(TcpData);</span><br><span class="line">		<span class="keyword">int</span> result = pcap_sendpacket(adhandle, SendBuffer,<span class="built_in">size</span>);</span><br><span class="line">		<span class="keyword">if</span> (result != <span class="number">0</span>)</span><br><span class="line">		&#123;</span><br><span class="line">			<span class="built_in">printf</span>(<span class="string">"Send Error!\n"</span>);</span><br><span class="line">		&#125; </span><br><span class="line">		<span class="keyword">else</span></span><br><span class="line">		&#123;</span><br><span class="line">			<span class="built_in">printf</span>(<span class="string">"Send TCP Packet.\n"</span>);</span><br><span class="line">			<span class="built_in">printf</span>(<span class="string">"Dstination Port:%d\n"</span>, ntohs(tcp.DstPort));</span><br><span class="line">			<span class="built_in">printf</span>(<span class="string">"Source Port:%d\n"</span>, ntohs(tcp.SrcPort));</span><br><span class="line">			<span class="built_in">printf</span>(<span class="string">"Sequence:%d\n"</span>, ntohl(tcp.SequenceNum));</span><br><span class="line">			<span class="built_in">printf</span>(<span class="string">"Acknowledgment:%d\n"</span>, ntohl(tcp.Acknowledgment));</span><br><span class="line">			<span class="built_in">printf</span>(<span class="string">"Header Length:%d*4\n"</span>, tcp.HdrLen &gt;&gt; <span class="number">4</span>);</span><br><span class="line">			<span class="built_in">printf</span>(<span class="string">"Flags:0x%0x\n"</span>, tcp.Flags);</span><br><span class="line">			<span class="built_in">printf</span>(<span class="string">"AdvertiseWindow:%d\n"</span>, ntohs(tcp.AdvertisedWindow));</span><br><span class="line">			<span class="built_in">printf</span>(<span class="string">"UrgPtr:%d\n"</span>, ntohs(tcp.UrgPtr));</span><br><span class="line">			<span class="built_in">printf</span>(<span class="string">"Checksum:%u\n"</span>, ntohs(tcp.Checksum));</span><br><span class="line">			<span class="built_in">printf</span>(<span class="string">"Send Successfully!\n"</span>);</span><br><span class="line">		&#125;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>校验和方法如下：</p>
                <figure class="highlight objectivec">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="comment">//获得校验和的方法</span></span><br><span class="line"><span class="keyword">unsigned</span> <span class="keyword">short</span> checksum(<span class="keyword">unsigned</span> <span class="keyword">short</span> *data, <span class="keyword">int</span> length)</span><br><span class="line">&#123;</span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">long</span> temp = <span class="number">0</span>;</span><br><span class="line">    <span class="keyword">while</span> (length &gt; <span class="number">1</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        temp +=  *data++;</span><br><span class="line">        length -= <span class="keyword">sizeof</span>(<span class="keyword">unsigned</span> <span class="keyword">short</span>);</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">if</span> (length)</span><br><span class="line">    &#123;</span><br><span class="line">        temp += *(<span class="keyword">unsigned</span> <span class="keyword">short</span>*)data;</span><br><span class="line">    &#125;</span><br><span class="line">    temp = (temp &gt;&gt; <span class="number">16</span>) + (temp &amp;<span class="number">0xffff</span>);</span><br><span class="line">    temp += (temp &gt;&gt; <span class="number">16</span>);</span><br><span class="line">    <span class="keyword">return</span> (<span class="keyword">unsigned</span> <span class="keyword">short</span>)(~temp);</span><br><span class="line">&#125;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>记得在声明一下这个方法。如果放在main函数前当然就不用声明啦。 另外需要声明的变量有</p>
                <figure class="highlight cpp">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">EthernetHeader</span> <span class="title">ethernet</span>;</span>    <span class="comment">//以太网帧头</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">IpHeader</span> <span class="title">ip</span>;</span>                            <span class="comment">//IP头</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">TcpHeader</span> <span class="title">tcp</span>;</span>                      <span class="comment">//TCP头</span></span><br><span class="line"> <span class="class"><span class="keyword">struct</span> <span class="title">PsdTcpHeader</span> <span class="title">ptcp</span>;</span>             <span class="comment">//TCP伪首部</span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <figure class="highlight cpp">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="keyword">unsigned</span> <span class="keyword">char</span> SendBuffer[<span class="number">200</span>];       <span class="comment">//发送队列</span></span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>接下来的运行结果：</p>
                <figure class="highlight angelscript">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line">获取MAC地址完毕,请输</span><br><span class="line"><span class="number">121.250</span><span class="number">.216</span><span class="number">.112</span></span><br><span class="line">请输入你要发送的内容</span><br><span class="line">what <span class="keyword">is</span> tcp</span><br><span class="line">要发送的内容:what i</span><br><span class="line">Send TCP Packet.</span><br><span class="line">Dstination Port:<span class="number">102</span></span><br><span class="line">Source Port:<span class="number">1000</span></span><br><span class="line">Sequence:<span class="number">11</span></span><br><span class="line">Acknowledgment:<span class="number">0</span></span><br><span class="line">Header Length:<span class="number">5</span>*<span class="number">4</span></span><br><span class="line">Flags:<span class="number">0x18</span></span><br><span class="line">AdvertiseWindow:<span class="number">512</span></span><br><span class="line">UrgPtr:<span class="number">0</span></span><br><span class="line">Checksum:<span class="number">17149</span></span><br><span class="line">Send Successfully!</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p>截图如下： <img src="http://img.blog.csdn.net/20141018211905731?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvY3FjcmU=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast" alt=""> 好啦，发送帧到此就告一段落啦！如果有疑问请留言。 帧的接收很简单，直接贴源码如下：</p>
                <figure class="highlight cpp">
                  <table>
                    <tr>
                      <td class="gutter">
                        <pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br><span class="line">118</span><br><span class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br><span class="line">123</span><br><span class="line">124</span><br><span class="line">125</span><br><span class="line">126</span><br><span class="line">127</span><br><span class="line">128</span><br><span class="line">129</span><br><span class="line">130</span><br><span class="line">131</span><br><span class="line">132</span><br><span class="line">133</span><br><span class="line">134</span><br><span class="line">135</span><br><span class="line">136</span><br><span class="line">137</span><br><span class="line">138</span><br><span class="line">139</span><br><span class="line">140</span><br><span class="line">141</span><br><span class="line">142</span><br><span class="line">143</span><br><span class="line">144</span><br><span class="line">145</span><br><span class="line">146</span><br><span class="line">147</span><br><span class="line">148</span><br><span class="line">149</span><br><span class="line">150</span><br><span class="line">151</span><br><span class="line">152</span><br><span class="line">153</span><br><span class="line">154</span><br><span class="line">155</span><br><span class="line">156</span><br><span class="line">157</span><br><span class="line">158</span><br><span class="line">159</span><br><span class="line">160</span><br><span class="line">161</span><br><span class="line">162</span><br><span class="line">163</span><br><span class="line">164</span><br><span class="line">165</span><br><span class="line">166</span><br><span class="line">167</span><br><span class="line">168</span><br><span class="line">169</span><br><span class="line">170</span><br><span class="line">171</span><br><span class="line">172</span><br><span class="line">173</span><br><span class="line">174</span><br><span class="line">175</span><br><span class="line">176</span><br><span class="line">177</span><br><span class="line">178</span><br><span class="line">179</span><br><span class="line">180</span><br><span class="line">181</span><br><span class="line">182</span><br><span class="line">183</span><br><span class="line">184</span><br><span class="line">185</span><br><span class="line">186</span><br><span class="line">187</span><br><span class="line">188</span><br><span class="line">189</span><br><span class="line">190</span><br><span class="line">191</span><br><span class="line">192</span><br><span class="line">193</span><br><span class="line">194</span><br><span class="line">195</span><br><span class="line">196</span><br><span class="line">197</span><br><span class="line">198</span><br><span class="line">199</span><br><span class="line">200</span><br><span class="line">201</span><br><span class="line">202</span><br><span class="line">203</span><br><span class="line">204</span><br><span class="line">205</span><br><span class="line">206</span><br><span class="line">207</span><br><span class="line">208</span><br><span class="line">209</span><br><span class="line">210</span><br><span class="line">211</span><br><span class="line">212</span><br><span class="line">213</span><br><span class="line">214</span><br><span class="line">215</span><br><span class="line">216</span><br><span class="line">217</span><br><span class="line">218</span><br><span class="line">219</span><br><span class="line">220</span><br><span class="line">221</span><br><span class="line">222</span><br><span class="line">223</span><br><span class="line">224</span><br><span class="line">225</span><br><span class="line">226</span><br><span class="line">227</span><br><span class="line">228</span><br><span class="line">229</span><br><span class="line">230</span><br><span class="line">231</span><br><span class="line">232</span><br><span class="line">233</span><br><span class="line">234</span><br><span class="line">235</span><br><span class="line">236</span><br><span class="line">237</span><br><span class="line">238</span><br><span class="line">239</span><br><span class="line">240</span><br><span class="line">241</span><br><span class="line">242</span><br><span class="line">243</span><br><span class="line">244</span><br><span class="line">245</span><br><span class="line">246</span><br><span class="line">247</span><br><span class="line">248</span><br><span class="line">249</span><br><span class="line">250</span><br><span class="line">251</span><br><span class="line">252</span><br><span class="line">253</span><br><span class="line">254</span><br><span class="line">255</span><br><span class="line">256</span><br><span class="line">257</span><br><span class="line">258</span><br><span class="line">259</span><br><span class="line">260</span><br><span class="line">261</span><br><span class="line">262</span><br><span class="line">263</span><br><span class="line">264</span><br><span class="line">265</span><br><span class="line">266</span><br><span class="line">267</span><br><span class="line">268</span><br><span class="line">269</span><br><span class="line">270</span><br><span class="line">271</span><br><span class="line">272</span><br><span class="line">273</span><br><span class="line">274</span><br><span class="line">275</span><br><span class="line">276</span><br><span class="line">277</span><br><span class="line">278</span><br><span class="line">279</span><br><span class="line">280</span><br><span class="line">281</span><br><span class="line">282</span><br><span class="line">283</span><br><span class="line">284</span><br><span class="line">285</span><br><span class="line">286</span><br><span class="line">287</span><br><span class="line">288</span><br><span class="line">289</span><br><span class="line">290</span><br><span class="line">291</span><br><span class="line">292</span><br><span class="line">293</span><br><span class="line">294</span><br><span class="line">295</span><br><span class="line">296</span><br><span class="line">297</span><br><span class="line">298</span><br><span class="line">299</span><br><span class="line">300</span><br><span class="line">301</span><br><span class="line">302</span><br><span class="line">303</span><br><span class="line">304</span><br><span class="line">305</span><br><span class="line">306</span><br><span class="line">307</span><br><span class="line">308</span><br><span class="line">309</span><br><span class="line">310</span><br><span class="line">311</span><br><span class="line">312</span><br><span class="line">313</span><br><span class="line">314</span><br><span class="line">315</span><br><span class="line">316</span><br><span class="line">317</span><br><span class="line">318</span><br><span class="line">319</span><br><span class="line">320</span><br><span class="line">321</span><br></pre>
                      </td>
                      <td class="code">
                        <pre><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;stdio.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;stdlib.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;pcap.h&gt;</span></span></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">char</span> *<span class="title">iptos</span><span class="params">(u_long in)</span></span>;       <span class="comment">//u_long即为 unsigned long</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">packet_handler</span><span class="params">(u_char *param, <span class="keyword">const</span> struct pcap_pkthdr *header, <span class="keyword">const</span> u_char *pkt_data)</span></span>;</span><br><span class="line"><span class="comment">//struct tm *ltime;					//和时间处理有关的变量</span></span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">IpAddress</span></span></span><br><span class="line"><span class="class">&#123;</span></span><br><span class="line">    u_char byte1;</span><br><span class="line">    u_char byte2;</span><br><span class="line">    u_char byte3;</span><br><span class="line">    u_char byte4;</span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="comment">//帧头部结构体，共14字节</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">EthernetHeader</span></span></span><br><span class="line"><span class="class">&#123;</span></span><br><span class="line">    u_char DestMAC[<span class="number">6</span>];    <span class="comment">//目的MAC地址 6字节</span></span><br><span class="line">    u_char SourMAC[<span class="number">6</span>];   <span class="comment">//源MAC地址 6字节</span></span><br><span class="line">    u_short EthType;         <span class="comment">//上一层协议类型，如0x0800代表上一层是IP协议，0x0806为arp  2字节</span></span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="comment">//IP头部结构体，共20字节</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">IpHeader</span></span></span><br><span class="line"><span class="class">&#123;</span></span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">char</span> Version_HLen;   <span class="comment">//版本信息4位 ，头长度4位 1字节</span></span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">char</span> TOS;                    <span class="comment">//服务类型    1字节</span></span><br><span class="line">    short Length;                              <span class="comment">//数据包长度 2字节</span></span><br><span class="line">    short Ident;                                 <span class="comment">//数据包标识  2字节</span></span><br><span class="line">    short Flags_Offset;                    <span class="comment">//标志3位，片偏移13位  2字节</span></span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">char</span> TTL;                    <span class="comment">//存活时间  1字节</span></span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">char</span> Protocol;           <span class="comment">//协议类型  1字节</span></span><br><span class="line">    short Checksum;                        <span class="comment">//首部校验和 2字节</span></span><br><span class="line">    IpAddress SourceAddr;           <span class="comment">//源IP地址   4字节</span></span><br><span class="line">    IpAddress DestinationAddr;   <span class="comment">//目的IP地址  4字节</span></span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="comment">//TCP头部结构体，共20字节</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">TcpHeader</span></span></span><br><span class="line"><span class="class">&#123;</span></span><br><span class="line">    <span class="keyword">unsigned</span> short SrcPort;                        <span class="comment">//源端口号  2字节</span></span><br><span class="line">    <span class="keyword">unsigned</span> short DstPort;                        <span class="comment">//目的端口号 2字节</span></span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">int</span> SequenceNum;               <span class="comment">//序号  4字节</span></span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">int</span> Acknowledgment;         <span class="comment">//确认号  4字节</span></span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">char</span> HdrLen;                         <span class="comment">//首部长度4位，保留位6位 共10位</span></span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">char</span> Flags;                              <span class="comment">//标志位6位</span></span><br><span class="line">    <span class="keyword">unsigned</span> short AdvertisedWindow;  <span class="comment">//窗口大小16位 2字节</span></span><br><span class="line">    <span class="keyword">unsigned</span> short Checksum;                  <span class="comment">//校验和16位   2字节</span></span><br><span class="line">    <span class="keyword">unsigned</span> short UrgPtr;						  <span class="comment">//紧急指针16位   2字节</span></span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="comment">//TCP伪首部结构体 12字节</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">PsdTcpHeader</span></span></span><br><span class="line"><span class="class">&#123;</span></span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">long</span> SourceAddr;                     <span class="comment">//源IP地址  4字节</span></span><br><span class="line">    <span class="keyword">unsigned</span> <span class="keyword">long</span> DestinationAddr;             <span class="comment">//目的IP地址 4字节</span></span><br><span class="line">    <span class="keyword">char</span> Zero;                                                    <span class="comment">//填充位  1字节</span></span><br><span class="line">    <span class="keyword">char</span> Protcol;                                               <span class="comment">//协议号  1字节</span></span><br><span class="line">    <span class="keyword">unsigned</span> short TcpLen;                           <span class="comment">//TCP包长度 2字节</span></span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">main</span><span class="params">()</span></span>&#123;</span><br><span class="line"></span><br><span class="line">	EthernetHeader *ethernet;    <span class="comment">//以太网帧头</span></span><br><span class="line">    IpHeader *ip;                            <span class="comment">//IP头</span></span><br><span class="line">    TcpHeader *tcp;                      <span class="comment">//TCP头</span></span><br><span class="line">    PsdTcpHeader *ptcp;             <span class="comment">//TCP伪首部</span></span><br><span class="line"></span><br><span class="line">	<span class="keyword">pcap_if_t</span>  * alldevs;       <span class="comment">//所有网络适配器</span></span><br><span class="line">	<span class="keyword">pcap_if_t</span>  *d;					<span class="comment">//选中的网络适配器</span></span><br><span class="line">	<span class="keyword">char</span> errbuf[PCAP_ERRBUF_SIZE];   <span class="comment">//错误缓冲区,大小为256</span></span><br><span class="line">	<span class="keyword">char</span> source[PCAP_ERRBUF_SIZE];</span><br><span class="line">	<span class="keyword">pcap_t</span> *adhandle;           <span class="comment">//捕捉实例,是pcap_open返回的对象</span></span><br><span class="line">	<span class="keyword">int</span> i = <span class="number">0</span>;                            <span class="comment">//适配器计数变量</span></span><br><span class="line">	<span class="class"><span class="keyword">struct</span> <span class="title">pcap_pkthdr</span> *<span class="title">header</span>;</span>    <span class="comment">//接收到的数据包的头部</span></span><br><span class="line">    <span class="keyword">const</span> u_char *pkt_data;			  <span class="comment">//接收到的数据包的内容</span></span><br><span class="line">	<span class="keyword">int</span> res;                                    <span class="comment">//表示是否接收到了数据包</span></span><br><span class="line">	u_int netmask;                       <span class="comment">//过滤时用的子网掩码</span></span><br><span class="line">	<span class="keyword">char</span> packet_filter[] = <span class="string">"tcp"</span>;        <span class="comment">//过滤字符</span></span><br><span class="line">	<span class="class"><span class="keyword">struct</span> <span class="title">bpf_program</span> <span class="title">fcode</span>;</span>                     <span class="comment">//pcap_compile所调用的结构体</span></span><br><span class="line"></span><br><span class="line">	u_int ip_len;                                       <span class="comment">//ip地址有效长度</span></span><br><span class="line">	u_short sport,dport;                        <span class="comment">//主机字节序列</span></span><br><span class="line">	u_char packet[<span class="number">100</span>];                       <span class="comment">//发送数据包目的地址</span></span><br><span class="line">	<span class="keyword">pcap_dumper_t</span> *dumpfile;         <span class="comment">//堆文件</span></span><br><span class="line"></span><br><span class="line">	<span class="comment">//time_t local_tv_sec;				//和时间处理有关的变量</span></span><br><span class="line">    <span class="comment">//char timestr[16];					//和时间处理有关的变量</span></span><br><span class="line"></span><br><span class="line">	</span><br><span class="line">	<span class="comment">//获取本地适配器列表</span></span><br><span class="line">	<span class="keyword">if</span>(pcap_findalldevs_ex(PCAP_SRC_IF_STRING,<span class="literal">NULL</span>,&amp;alldevs,errbuf) == <span class="number">-1</span>)&#123;</span><br><span class="line">		<span class="comment">//结果为-1代表出现获取适配器列表失败</span></span><br><span class="line">		<span class="built_in">fprintf</span>(<span class="built_in">stderr</span>,<span class="string">"Error in pcap_findalldevs_ex:\n"</span>,errbuf);</span><br><span class="line">		<span class="comment">//exit(0)代表正常退出,exit(other)为非正常退出,这个值会传给操作系统</span></span><br><span class="line">		<span class="built_in">exit</span>(<span class="number">1</span>);</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="comment">//打印设备列表信息</span></span><br><span class="line">	<span class="keyword">for</span>(d = alldevs;d !=<span class="literal">NULL</span>;d = d-&gt;next)&#123;</span><br><span class="line">		<span class="built_in">printf</span>(<span class="string">"-----------------------------------------------------------------\nnumber:%d\nname:%s\n"</span>,++i,d-&gt;name);</span><br><span class="line">		<span class="keyword">if</span>(d-&gt;description)&#123;</span><br><span class="line">			<span class="comment">//打印适配器的描述信息</span></span><br><span class="line">			<span class="built_in">printf</span>(<span class="string">"description:%s\n"</span>,d-&gt;description);</span><br><span class="line">		&#125;<span class="keyword">else</span>&#123;</span><br><span class="line">			<span class="comment">//适配器不存在描述信息</span></span><br><span class="line">			<span class="built_in">printf</span>(<span class="string">"description:%s"</span>,<span class="string">"no description\n"</span>);</span><br><span class="line">		&#125;</span><br><span class="line">		<span class="comment">//打印本地环回地址</span></span><br><span class="line">		<span class="built_in">printf</span>(<span class="string">"\tLoopback: %s\n"</span>,(d-&gt;flags &amp; PCAP_IF_LOOPBACK)?<span class="string">"yes"</span>:<span class="string">"no"</span>);</span><br><span class="line">		</span><br><span class="line">		 <span class="keyword">pcap_addr_t</span> *a;       <span class="comment">//网络适配器的地址用来存储变量</span></span><br><span class="line">		 <span class="keyword">for</span>(a = d-&gt;addresses;a;a = a-&gt;next)&#123;</span><br><span class="line">			 <span class="comment">//sa_family代表了地址的类型,是IPV4地址类型还是IPV6地址类型</span></span><br><span class="line">			 <span class="keyword">switch</span> (a-&gt;addr-&gt;sa_family)</span><br><span class="line">			 &#123;</span><br><span class="line">				 <span class="keyword">case</span> AF_INET:  <span class="comment">//代表IPV4类型地址</span></span><br><span class="line">					 <span class="built_in">printf</span>(<span class="string">"Address Family Name:AF_INET\n"</span>);</span><br><span class="line">					 <span class="keyword">if</span>(a-&gt;addr)&#123;</span><br><span class="line">						 <span class="comment">//-&gt;的优先级等同于括号,高于强制类型转换,因为addr为sockaddr类型，对其进行操作须转换为sockaddr_in类型</span></span><br><span class="line">						 <span class="built_in">printf</span>(<span class="string">"Address:%s\n"</span>,iptos(((struct sockaddr_in *)a-&gt;addr)-&gt;sin_addr.s_addr));</span><br><span class="line">					 &#125;</span><br><span class="line">					<span class="keyword">if</span> (a-&gt;netmask)&#123;</span><br><span class="line">						 <span class="built_in">printf</span>(<span class="string">"\tNetmask: %s\n"</span>,iptos(((struct sockaddr_in *)a-&gt;netmask)-&gt;sin_addr.s_addr));</span><br><span class="line">					&#125;</span><br><span class="line">					<span class="keyword">if</span> (a-&gt;broadaddr)&#123;</span><br><span class="line">						   <span class="built_in">printf</span>(<span class="string">"\tBroadcast Address: %s\n"</span>,iptos(((struct sockaddr_in *)a-&gt;broadaddr)-&gt;sin_addr.s_addr));</span><br><span class="line">					 &#125;</span><br><span class="line">					 <span class="keyword">if</span> (a-&gt;dstaddr)&#123;</span><br><span class="line">						   <span class="built_in">printf</span>(<span class="string">"\tDestination Address: %s\n"</span>,iptos(((struct sockaddr_in *)a-&gt;dstaddr)-&gt;sin_addr.s_addr));</span><br><span class="line">					 &#125;</span><br><span class="line">        			 <span class="keyword">break</span>;</span><br><span class="line">				 <span class="keyword">case</span> AF_INET6: <span class="comment">//代表IPV6类型地址</span></span><br><span class="line">					 <span class="built_in">printf</span>(<span class="string">"Address Family Name:AF_INET6\n"</span>);</span><br><span class="line">					 <span class="built_in">printf</span>(<span class="string">"this is an IPV6 address\n"</span>);</span><br><span class="line">					 <span class="keyword">break</span>;</span><br><span class="line">				 <span class="keyword">default</span>:</span><br><span class="line">					 <span class="keyword">break</span>;</span><br><span class="line">			 &#125;</span><br><span class="line">		 &#125;</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="comment">//i为0代表上述循环未进入,即没有找到适配器,可能的原因为Winpcap没有安装导致未扫描到</span></span><br><span class="line">	<span class="keyword">if</span>(i == <span class="number">0</span>)&#123;</span><br><span class="line">		<span class="built_in">printf</span>(<span class="string">"interface not found,please check winpcap installation"</span>);</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="keyword">int</span> num;</span><br><span class="line">	<span class="built_in">printf</span>(<span class="string">"Enter the interface number(1-%d):"</span>,i);</span><br><span class="line">	<span class="comment">//让用户选择选择哪个适配器进行抓包</span></span><br><span class="line">	scanf_s(<span class="string">"%d"</span>,&amp;num);</span><br><span class="line">	<span class="built_in">printf</span>(<span class="string">"\n"</span>);</span><br><span class="line"></span><br><span class="line">	<span class="comment">//用户输入的数字超出合理范围</span></span><br><span class="line">	<span class="keyword">if</span>(num&lt;<span class="number">1</span>||num&gt;i)&#123;</span><br><span class="line">		<span class="built_in">printf</span>(<span class="string">"number out of range\n"</span>);</span><br><span class="line">		pcap_freealldevs(alldevs);</span><br><span class="line">		<span class="keyword">return</span> <span class="number">-1</span>;</span><br><span class="line">	&#125;</span><br><span class="line">	<span class="comment">//跳转到选中的适配器</span></span><br><span class="line">	<span class="keyword">for</span>(d=alldevs, i=<span class="number">0</span>; i&lt; num<span class="number">-1</span> ; d=d-&gt;next, i++);</span><br><span class="line"></span><br><span class="line">	<span class="comment">//运行到此处说明用户的输入是合法的</span></span><br><span class="line">	<span class="keyword">if</span>((adhandle = pcap_open(d-&gt;name,		<span class="comment">//设备名称</span></span><br><span class="line">														<span class="number">65535</span>,       <span class="comment">//存放数据包的内容长度</span></span><br><span class="line">														PCAP_OPENFLAG_PROMISCUOUS,  <span class="comment">//混杂模式</span></span><br><span class="line">														<span class="number">1000</span>,           <span class="comment">//超时时间</span></span><br><span class="line">														<span class="literal">NULL</span>,          <span class="comment">//远程验证</span></span><br><span class="line">														errbuf         <span class="comment">//错误缓冲</span></span><br><span class="line">														)) == <span class="literal">NULL</span>)&#123;</span><br><span class="line">        <span class="comment">//打开适配器失败,打印错误并释放适配器列表</span></span><br><span class="line">		<span class="built_in">fprintf</span>(<span class="built_in">stderr</span>,<span class="string">"\nUnable to open the adapter. %s is not supported by WinPcap\n"</span>, d-&gt;name);</span><br><span class="line">        <span class="comment">// 释放设备列表 </span></span><br><span class="line">        pcap_freealldevs(alldevs);</span><br><span class="line">        <span class="keyword">return</span> <span class="number">-1</span>;</span><br><span class="line">	&#125;</span><br><span class="line">	</span><br><span class="line"></span><br><span class="line">	<span class="comment">//打印输出,正在监听中</span></span><br><span class="line">	<span class="built_in">printf</span>(<span class="string">"\nlistening on %s...\n"</span>, d-&gt;description);</span><br><span class="line"></span><br><span class="line">	<span class="comment">//所在网络不是以太网,此处只取这种情况</span></span><br><span class="line">	<span class="keyword">if</span>(pcap_datalink(adhandle) != DLT_EN10MB)</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="built_in">fprintf</span>(<span class="built_in">stderr</span>,<span class="string">"\nThis program works only on Ethernet networks.\n"</span>);</span><br><span class="line">        <span class="comment">//释放列表</span></span><br><span class="line">        pcap_freealldevs(alldevs);</span><br><span class="line">        <span class="keyword">return</span> <span class="number">-1</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">	<span class="comment">//先获得地址的子网掩码</span></span><br><span class="line">	<span class="keyword">if</span>(d-&gt;addresses != <span class="literal">NULL</span>)</span><br><span class="line">        <span class="comment">//获得接口第一个地址的掩码 </span></span><br><span class="line">        netmask=((struct sockaddr_in *)(d-&gt;addresses-&gt;netmask))-&gt;sin_addr.S_un.S_addr;</span><br><span class="line">    <span class="keyword">else</span></span><br><span class="line">        <span class="comment">// 如果接口没有地址，那么我们假设一个C类的掩码</span></span><br><span class="line">        netmask=<span class="number">0xffffff</span>;</span><br><span class="line"></span><br><span class="line">	<span class="comment">//pcap_compile()的原理是将高层的布尔过滤表</span></span><br><span class="line">	<span class="comment">//达式编译成能够被过滤引擎所解释的低层的字节码</span></span><br><span class="line">	<span class="keyword">if</span>(pcap_compile(adhandle,	<span class="comment">//适配器处理对象</span></span><br><span class="line">										&amp;fcode,</span><br><span class="line">										packet_filter,   <span class="comment">//过滤ip和UDP</span></span><br><span class="line">										<span class="number">1</span>,                       <span class="comment">//优化标志</span></span><br><span class="line">										netmask           <span class="comment">//子网掩码</span></span><br><span class="line">										)&lt;<span class="number">0</span>)</span><br><span class="line">	&#123;</span><br><span class="line">		<span class="comment">//过滤出现问题</span></span><br><span class="line">		<span class="built_in">fprintf</span>(<span class="built_in">stderr</span>,<span class="string">"\nUnable to compile the packet filter. Check the syntax.\n"</span>);</span><br><span class="line">        <span class="comment">// 释放设备列表</span></span><br><span class="line">        pcap_freealldevs(alldevs);</span><br><span class="line">        <span class="keyword">return</span> <span class="number">-1</span>;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	<span class="comment">//设置过滤器</span></span><br><span class="line">    <span class="keyword">if</span> (pcap_setfilter(adhandle, &amp;fcode)&lt;<span class="number">0</span>)</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="built_in">fprintf</span>(<span class="built_in">stderr</span>,<span class="string">"\nError setting the filter.\n"</span>);</span><br><span class="line">        <span class="comment">//释放设备列表</span></span><br><span class="line">        pcap_freealldevs(alldevs);</span><br><span class="line">        <span class="keyword">return</span> <span class="number">-1</span>;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">	<span class="comment">//利用pcap_next_ex来接受数据包</span></span><br><span class="line">	<span class="keyword">while</span>((res = pcap_next_ex(adhandle,&amp;header,&amp;pkt_data))&gt;=<span class="number">0</span>)</span><br><span class="line">	&#123;</span><br><span class="line">		<span class="keyword">if</span>(res ==<span class="number">0</span>)&#123;</span><br><span class="line">			<span class="comment">//返回值为0代表接受数据包超时，重新循环继续接收</span></span><br><span class="line">			<span class="keyword">continue</span>;</span><br><span class="line">		&#125;<span class="keyword">else</span>&#123;</span><br><span class="line">			<span class="comment">//运行到此处代表接受到正常从数据包</span></span><br><span class="line">			<span class="comment">//header为帧的头部</span></span><br><span class="line">			<span class="built_in">printf</span>(<span class="string">"%.6ld len:%d "</span>, header-&gt;ts.tv_usec, header-&gt;len);</span><br><span class="line">			<span class="comment">// 获得IP数据包头部的位置</span></span><br><span class="line">			ip = (IpHeader *) (pkt_data +<span class="number">14</span>);    <span class="comment">//14为以太网帧头部长度</span></span><br><span class="line">			<span class="comment">//获得TCP头部的位置</span></span><br><span class="line">			ip_len = (ip-&gt;Version_HLen &amp; <span class="number">0xf</span>) *<span class="number">4</span>;</span><br><span class="line">			<span class="built_in">printf</span>(<span class="string">"ip_length:%d "</span>,ip_len);</span><br><span class="line">			tcp = (TcpHeader *)((u_char *)ip+ip_len);</span><br><span class="line">			<span class="keyword">char</span> * data;</span><br><span class="line">			 data = (<span class="keyword">char</span> *)((u_char *)tcp+<span class="number">20</span>);</span><br><span class="line">			 <span class="comment">//将网络字节序列转换成主机字节序列</span></span><br><span class="line">			sport = ntohs( tcp-&gt;SrcPort );</span><br><span class="line">			dport = ntohs( tcp-&gt;DstPort );</span><br><span class="line">			<span class="built_in">printf</span>(<span class="string">"srcport:%d desport:%d\n"</span>,sport,dport);</span><br><span class="line">			<span class="built_in">printf</span>(<span class="string">"%d.%d.%d.%d.%d -&gt; %d.%d.%d.%d.%d\n"</span>,</span><br><span class="line">					ip-&gt;SourceAddr.byte1,</span><br><span class="line">					ip-&gt;SourceAddr.byte2,</span><br><span class="line">					ip-&gt;SourceAddr.byte3,</span><br><span class="line">					ip-&gt;SourceAddr.byte4,</span><br><span class="line">				    sport,</span><br><span class="line">				    ip-&gt;DestinationAddr.byte1,</span><br><span class="line">				    ip-&gt;DestinationAddr.byte2,</span><br><span class="line">				    ip-&gt;DestinationAddr.byte3,</span><br><span class="line">				    ip-&gt;DestinationAddr.byte4,</span><br><span class="line">				    dport);</span><br><span class="line">			<span class="built_in">printf</span>(<span class="string">"%s\n"</span>,data);</span><br><span class="line">		&#125;</span><br><span class="line"></span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	</span><br><span class="line">	<span class="comment">//释放网络适配器列表</span></span><br><span class="line">	pcap_freealldevs(alldevs);</span><br><span class="line"></span><br><span class="line">	<span class="comment">/**</span></span><br><span class="line"><span class="comment">	int pcap_loop  ( pcap_t *  p,  </span></span><br><span class="line"><span class="comment">								  int  cnt,  </span></span><br><span class="line"><span class="comment">								  pcap_handler  callback,  </span></span><br><span class="line"><span class="comment">								  u_char *  user   </span></span><br><span class="line"><span class="comment">								 );</span></span><br><span class="line"><span class="comment">     typedef void (*pcap_handler)(u_char *, const struct pcap_pkthdr *,</span></span><br><span class="line"><span class="comment">                 const u_char *);</span></span><br><span class="line"><span class="comment">	*/</span></span><br><span class="line">	<span class="comment">//开始捕获信息,当捕获到数据包时,会自动调用这个函数</span></span><br><span class="line">	<span class="comment">//pcap_loop(adhandle,0,packet_handler,NULL);</span></span><br><span class="line"></span><br><span class="line">	<span class="keyword">int</span> inum;</span><br><span class="line">	scanf_s(<span class="string">"%d"</span>, &amp;inum);</span><br><span class="line"></span><br><span class="line">	<span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line"></span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 每次捕获到数据包时，libpcap都会自动调用这个回调函数 */</span></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment">pcap_loop()函数是基于回调的原理来进行数据捕获的，如技术文档所说，这是一种精妙的方法，并且在某些场合下，</span></span><br><span class="line"><span class="comment">它是一种很好的选择。但是在处理回调有时候会并不实用，它会增加程序的复杂度，特别是在多线程的C++程序中</span></span><br><span class="line"><span class="comment">*/</span></span><br><span class="line"><span class="comment">/*</span></span><br><span class="line"><span class="comment">void packet_handler(u_char *param, const struct pcap_pkthdr *header, const u_char *pkt_data)</span></span><br><span class="line"><span class="comment">&#123;</span></span><br><span class="line"><span class="comment">    struct tm *ltime = NULL;</span></span><br><span class="line"><span class="comment">    char timestr[16];</span></span><br><span class="line"><span class="comment">    time_t local_tv_sec;</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">    // 将时间戳转换成可识别的格式</span></span><br><span class="line"><span class="comment">    local_tv_sec = header-&gt;ts.tv_sec;</span></span><br><span class="line"><span class="comment">    localtime_s(ltime,&amp;local_tv_sec);</span></span><br><span class="line"><span class="comment">    strftime( timestr, sizeof timestr, "%H:%M:%S", ltime);</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">    printf("%s,%.6ld len:%d\n", timestr, header-&gt;ts.tv_usec, header-&gt;len);</span></span><br><span class="line"><span class="comment"></span></span><br><span class="line"><span class="comment">&#125;</span></span><br><span class="line"><span class="comment">*/</span></span><br><span class="line"><span class="comment">/* 将数字类型的IP地址转换成字符串类型的 */</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">define</span> IPTOSBUFFERS    12</span></span><br><span class="line"><span class="function"><span class="keyword">char</span> *<span class="title">iptos</span><span class="params">(u_long in)</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    <span class="keyword">static</span> <span class="keyword">char</span> output[IPTOSBUFFERS][<span class="number">3</span>*<span class="number">4</span>+<span class="number">3</span>+<span class="number">1</span>];</span><br><span class="line">    <span class="keyword">static</span> short which;</span><br><span class="line">    u_char *p;</span><br><span class="line"></span><br><span class="line">    p = (u_char *)&amp;in;</span><br><span class="line">    which = (which + <span class="number">1</span> == IPTOSBUFFERS ? <span class="number">0</span> : which + <span class="number">1</span>);</span><br><span class="line">    sprintf_s(output[which], <span class="string">"%d.%d.%d.%d"</span>, p[<span class="number">0</span>], p[<span class="number">1</span>], p[<span class="number">2</span>], p[<span class="number">3</span>]);</span><br><span class="line">    <span class="keyword">return</span> output[which];</span><br><span class="line">&#125;</span><br></pre>
                      </td>
                    </tr>
                  </table>
                </figure>
                <p> 运行截图如下 <img src="http://img.blog.csdn.net/20141018212813479?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvY3FjcmU=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast" alt=""> <img src="http://img.blog.csdn.net/20141018212943896?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvY3FjcmU=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast" alt=""> Thank You 如有问题，欢迎留言~</p>
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